Sheet-metal construction



1931'- R. F. CARPENTE R 51' AL. 52

SHEET METAL CONSTRUCTION Filed May 15. 1929 INVENTOR TTORNEYS Z A 2 PM. FA 2% Z Z i, 5

Patented Feb. 18, 1931 warren srarss earner orricE ROBERT F. CARPENTER AND PI-310M S ANDERSON, E CLEVELAND, OHIO, ASSIGNORS TO THE SANYMETAL PRODUCTS COMPANY, OF CLEVELAND, OHIO, A CORPORATION o Application filed May 15,

This invention relates to sheet metal construction and more particularly to sheet metal box structures such as boiler covers. Such covers while of relatively large dimensions are desirably of rather light gauge metal, for minimizing their cost and since their function is principally to surround the boiler, although it is, of course, desirable that maximum strength .and rigidity be had; but since the boiler is finished oil by the cover ,itis highly important that the cover present a most pleasing appearance.

Our invention contemplates as general objects a sheet metal boiler-cover box-structure which shall present a pleasing appearance, with all joints concealed so far as possible, and which shall be of maximum strength and rigidity for its weight.

To this end we provide for mouldings along the box edges, permanently secured with the box walls so far as possible, and arranged that the mouldings conceal their joints with the wall panels whether or not permanently secured therewith. e further provide for permanent assembly of r the side corner mouldings with the end panels and provide for securement between the side panels and these mouldings by means of locking strips slidable upon the parts; and a top wall having a moulding extending about its edges permanently secured therewith and fitting over the upper extremities of the wall members to bind the same together, whereby the assembly box structure is complete without the use of bolts, screws, or the like. Vie also provide in the construction of our moulding a dead-air chamber which serves efiiciently for heat insulation at the top edges of the cover where such heat insulation has heretofore been diflicult to obtain; and otherwise provide for a neat fit between the usual nonmetallic insulation and the metal cover therefor. h

The exact nature of our invention together with further obj ectsand advantages thereof SHEET-METAL CONSTRUCTION 1929. Serial No. 363,320.

will-be apparent from the following description taken in connection with the accompanying drawings, which show details of a boiler cover constructed according to our invention, in which Fig. 1 is a plan view of a corner portion of a boiler cover following the teachingsv of our invention as with the top removed; Fig. 2 is a perspective view of the same; Fig. 3 is a typical vertical section showing details of the side and top Walls, with the relativeposition of non-metallic boiler heat insulation indicated in broken lines; Fig. l is a plan view of a corner of the completed assembly; Fig. 5 is a perspective view of the parts appearing in Fig. 4:; and Fig. 6 is a typical horizontal section through a boiler cover constructed as indicated in the preceding views. 7

It will be understood that the boiler cover is generally rectangular, having the usual end, side, and top walls with mouldings along the eight adjoining-wall edges, the drawings, generally speaking, showing only pertinent details in the zones of wall j oinder; and the terms end walls and side walls being used merely for-purposes of clearness and to distinguish rectangularly disposed vertical walls.

lVith reference now to the drawings and particularly to Fig. 6 thereof, the end walls 1 include central panel portions 2 having at theirside edges vertical mouldings 8 permanently secured therewith as my providing the mouldings with lip portions 4: underlying the panel portions 2 and spot-welded at intervals therewith as at 5. The mouldings 3 are offset or outstanding from the panel portions 2 to which they are securedso that a shoulder 6 is formed adjacent the panel portion and the raw edge of the panel portion will be thus protected and substantially concealed.

Each moulding extends into a side plane normal to that of its end wall, and is inwardly bent as indicated Fig. 1 along its free edge.

Side walls are provided between the end walls and comprise panel members 7 extending between the mouldings 3 and located within the outer side 1 of the 'nouldings so that shoulders 8 are for ned between the mouldings and side par. 1 members, similar to the shoulders (i be con the mouldings and the end panel mcmb cent e:-:trcmi-- ties of each moulding and its Uflc panel member are bent to form oppositely extending lips as indicated Fig. 1 and the lips are engaged by a locking strip 9 forced downwardlv thcreovcr to maintain the parts in the described assembly.

Thus a tour-sided box structure is had as iiulicatcd Fig. 6, comprised generally of a pair of end units each including a panel and a pair of mouldings, and a pair of side units each forming a panel bet eon the corresponding pair of mouldings of the end units.

The mouldings 3 and the locking strips tau.

'9 extend upwardly and terminate in a horizontal plane. This plane defines the upper extrcmeties of the vertical panels, but the panel members extend u nvardly of this plane. Thus as shown Figs. 2 and 3, the panel. member 7 is provided with an extension 10 bent inwardly, upwardly, and inwardly, to form a horizontal shoulder 11 and thereabove a horizontal platform 12 in step relation with the shoulder. These extensions upon the. side panel members terminate endwise of these members short of the zones of the locking strips 9 as indicated Figs. 1 and 2, so that assembly and disassembly of the end and side wall units may be had; the corresponding extensions on the end panel members requiring no such cutaway provision.

Thus at the top of the assembly of the four vertical walls there is a shoulder in the plane of the tops of the vertical mouldings 3 and a platform in a parallel plane thereabove, both the shoulder and the platform extending about the tour-wall assembly but interrupted at the corners of the assembly by gaps between the panel extensions.

\Ve provide a cover unit for the assembly comprising a rectangular top panel member 13 having, extending entirely about its edges, :1 n'mulding comprised of four mouldingmembers 14. Each moulding member l l has a lip 15 underlying the top panel 18 and spot-welded at intervals thereto as at 16, and each moulding 14 has a shoulder 17 adjacent the edge of the top panel 13 similar to the shoulder 6 of the vertical mouldings, so that the mouldings 14.- are upstanding from the panel 13 concealing and protecting its edges. Gach moulding 14L also extends outwardly to rest upon the platform 12 of its corresponding side wall member and therebeyond, overhanging the corresponding side panel, and having an inwardly turned lipltl to rest upon the corresponding shoulderll; all as shown in Fig. 2 wherein it will be noted that the proportion and arrangement oi the parts is such that the overhang of the moulding 14E beyond its side panel member 7 'lar to the extension of the moulding above the top panel 13, and of the mouldf5 above the end and side wall panels. ms the assembly is completed by merely the cover unit upon the side wall asthe moulding 14L resting upon the 12 and the lips 18 maintaining the against relative horizontal movcn'ient. at the same time all of the eight mouldings present a uniform appearance and conceal all joints between the parts.

It will be noted that the assembly is complete without the use of screws, bolts, or the like; and that, with the parts painted or en amolled, it becomes almost impossible to discern where the separable joints are located.

As indicated Fig. 3 the proportion of the parts issuch that the boiler cover fits over the usual top and side heat insulating sheets 19 and 20 respectively; and that a hollow 21 is termed between the mouldings 1stand the corresponding side-wall panel-extensions. Gbviously the four hollows 21 nicely provide heat insulation at the edge gaps between the members 19 and 20.

lVhat we claim is:

1. Sheet metal construction for boiler cov- "rs and like box structures comprising aside wall member haviug a panel portion, and thereabove bent inwardly, upwardly, and in wardly, to form a shoulder and a platform in step relation, and a top member having a moulding portion along a side edge, adapted to rest upon said platform, extending therebeyond overhanging said side member panel portion, and having an'inwardly turned lip to rest upon said shoulder.

2. Sheet metal construction for boiler covers and like box structures comprising an end wall member having panel portion with a moulding portion permanently secured with its side edge, said moulding portion outstancb ing from said panel portion to form a shoulder therewith and extending into a side plane normal thereto and having an inwardly turned lip along its rearward extremity, and a side wall member arranged inside said plane and secured with said lip whereby a shoulder is formed between said side wall member and said moulding similar in appearance to the shoulder between said end panel and said moulding.

8. Sheet metal construction for boiler covers and like box structures, comprising adjacent side wall members having panel portions joined by a moulding outstanding from said panel portions, said wall members having extensions above their panel portions and bent inwardly and upwardly to form shoulders, said moulding extending only to the zone of said shoulders, and a top member having a moulding portion along its side edges, adapted to fit over said upstanding side Wall portions, extending therebeyond overhanging said panel portions correspondingly as said first named moulding is outstanding from the panel portions, and having an inwardly turned lip to rest upon said shoulders.

In testimony whereof We hereby afiix our signatures.

ROBERT F. CARPENTER. THOMAS F. ANDERSON. 

